Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c04739a52db21a0…

MALICIOUS

PDF

64.0 KB Created: 2021-04-27 18:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57319d1e91e32e3525b76db6340b7ee SHA-1: 6191073ec3295338612633997f0f7ed93a143c6b SHA-256: 6c04739a52db21a0b2a1b90bb76fc7a96905566c615fb6fa3e7930d4fdcf82c3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains links to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the PDF structure itself is used to host and link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cf6522gc1rq9q1m381s9j5nh14/vixiwetazujap.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfa6e534a---vilajadumewatomitelivat.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8367c85a---65034651103.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9df1d7942f70d73dcc45b9c1329364e/nizudokaviguzikovavazirop.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160706f933df70---zeradisuviretibu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2ac2d35068ddce9f2db3aee771302c3c/16830748100.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bc99b46a3afc483a89b79a5f2021d288/betekidekomorevatewu.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6b4da57b13f2ce1315d38f20bc1ba8ea/gikujapemexorelaju.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607730923bd48---27787336026.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c569u078757qg0mfoc0f1onl76/53395737390.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c1f7ed7c0c0f3c6881b791f2039fff93/26043493434.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78e057ea7---44191709393.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2cdr9t7n2kbj83viqpvfjf095d/13264926016.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7102aceb9---7446583512.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05a47217f---kusuwivegobegi.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125020ec33---73271624403.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f692fbc6af3e38cd5947c07891883f6/veseduvalasaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=answer+key+in+science+10+module+1
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddb.bin
c8455b80c2dd1805c52e3bfa6722df765b293db3d0d096ba0a595f730271f70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 5316 bytes

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